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This week, the ratings of 23 Oil and Gas stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

McMoRan Exploration (NYSE:MMR) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. McMoran Exploration explores for and produces oil and gas offshore in the Gulf of Mexico and onshore in the Gulf Coast area. In Portfolio Grader’s specific subcategories of Earnings Momentum, Earnings Revisions, Equity, Cash Flow, and Sales Growth, MMR also gets F’s. The stock price has dropped 6.4% over the past month, worse than the 2.7% increase the S&P 500 has seen over the same period of time. As of Sept. 7, 14.7% of outstanding McMoRan Exploration shares were held short. For a full analysis of MMR stock, visit Portfolio Grader.

Rex American Resources‘s (NYSE:REX) rating weakens this week, dropping to a D versus last week’s C. Rex American Resources produces ethanol. The stock gets F’s in Earnings Growth, Earnings Momentum, and Earnings Surprise. The stock price has fallen 0.6% over the past month. For a full analysis of REX stock, visit Portfolio Grader.

Navios Maritime Acquisition (NYSE:NNA) is having a tough week. The company’s rating falls from a C to a D rating. Navios Maritime Acquisition is an owner and operator of tanker vessels focusing in the transportation of petroleum products (clean and dirty) and bulk liquid chemicals. The stock also rates an F in Cash Flow. Share prices fell 9.7% over the past month. For more information, get Portfolio Grader’s complete analysis of NNA stock.

Slipping from a C to a D rating, Alliance Resource Partners (NASDAQ:ARLP) takes a hit this week. Alliance Resource Partners produces and markets coal, primarily to major United States utilities and industrial users. The stock also gets an F in Cash Flow. The price of ARLP dropped 1.9% from a month ago. For a full analysis of ARLP stock, visit Portfolio Grader.

Berry Petroleum (NYSE:BRY) experiences a ratings drop this week, going from last week’s D to an F. Berry Petroleum is an independent energy company engaged in the production, development, acquisition, exploitation of and exploration for crude oil and natural gas. The stock receives F’s in Earnings Revisions, Earnings Surprise, Equity, and Margin Growth. Investors seem to agree with the downgrade and have pushed down the share price 4.3% over the past month. To get an in-depth look at BRY, get Portfolio Grader’s complete analysis of BRY stock.

This week, Cimarex Energy (NYSE:XEC) drops from a D to an F rating. Cimarex is an oil and gas exploration and production company with operations in Texas, Oklahoma, New Mexico, Kansas and Wyoming. The stock gets F’s in Earnings Growth, Earnings Revisions, and Earnings Surprise. Cash Flow and Sales Growth also get F’s. For a full analysis of XEC stock, visit Portfolio Grader.

PDC Energy (NASDAQ:PETD) gets weaker ratings this week as last week’s C drops to a D. PDC is an oil and gas company with drilling and production operations in the Rocky Mountains, the Appalachian Basin, and Michigan. The stock gets F’s in Earnings Revisions and Cash Flow. As of Sept. 7, 17.8% of outstanding PDC Energy shares were held short. For more information, get Portfolio Grader’s complete analysis of PETD stock.

PetroQuest Energy (NYSE:PQ) earns an F this week, falling from last week’s grade of D. PetroQuest Energy explores, develops, acquires, and operates oil and gas properties onshore and offshore in the Gulf Coast Region. The stock receives F’s in Earnings Momentum, Equity, and Cash Flow. Margin Growth and Sales Growth also get F’s. For a full analysis of PQ stock, visit Portfolio Grader.

Harvest Natural Resources (NYSE:HNR) experiences a ratings drop this week, going from last week’s C to a D. Harvest Natural Resources is an independent oil and gas exploration and development company with principal operations in Venezuela and Russia. The stock gets F’s in Earnings Revisions, Equity, and Cash Flow. As of Sept. 7, 17.7% of outstanding Harvest Natural Resources shares were held short. To get an in-depth look at HNR, get Portfolio Grader’s complete analysis of HNR stock.

BP Prudhoe Bay Royalty Trust (NYSE:BPT) is having a tough week. The company’s rating falls from a C to a D rating. BP Prudhoe Bay Royalty Trust holds overriding royalty interests constituting a non-operational interest in minerals in the Prudhoe Bay oil field located on the North Slope in Alaska. The stock price has fallen 25.2% over the past month. For a full analysis of BPT stock, visit Portfolio Grader.

The rating of Cross Timbers Royalty (NYSE:CRT) declines this week from a C to a D. Cross Timbers Royalty is an express trust in the United States. The stock also gets an F in Sales Growth. Investors seem to agree with the downgrade and have pushed down the share price 10.8% over the past month. For a full analysis of CRT stock, visit Portfolio Grader.

Advantage Oil & Gas (NYSE:AAV) gets weaker ratings this week as last week’s D drops to an F. Advantage Oil & Gas is actively engaged in the business of oil and gas exploitation, development, acquisition and production. The stock gets F’s in Earnings Growth, Earnings Revisions, and Equity. Cash Flow and Sales Growth also get F’s. The price of AAV is down 7.1% from a month ago. For a full analysis of AAV stock, visit Portfolio Grader.

Equal Energy‘s (NYSE:EQU) rating weakens this week, dropping to an F versus last week’s D. Equal Energy acquires, drills, operates, and exploits oil and natural gas wells in Western Canada. The stock receives F’s in Earnings Growth, Earnings Momentum, and Earnings Revisions. Equity and Sales Growth also get F’s. For more information, get Portfolio Grader’s complete analysis of EQU stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.